TM 1-1520-240-10
5-9-1/(5-9-2 blank)
SECTION IX. ADDITIONAL LIMITATIONS
5-9-1. Air-to-Ground Towing.
Air-to-ground towing operations are prohibited.
5-9-2. APU Operation.
APU operation in flight is prohibited except during emer-
gencies.
5-9-3. Pitot Tube and AFCS Sideslip Port Anti-Icing
Limitation.
The PITOT switch shall not be on for more than 5 minutes
on the ground.
5-9-4. Windshield Heat.
Windshield heat shall not be used above 24_C.
5-9-5. Single Point Refueling.
The maximum rate for pressure refueling is 300 gal/min
at 55 psi.
5-9-6. Extended Range Fuel System (ERFS).
WARNING
Installing the non-crashworthy/non self
sealing ERFS increases the potential for
explosion and burn injuries during a
crash. Therefore, the number of personnel
on board the helicopter should be kept to
the minimum required to perform the re-
quired mission.
ERFS operation will be in accordance with existing Air
Worthiness Release (AWR).
5-9-7. Extended Range Fuel System II (ERFS II)
The following paragraphs contain important operating
limits and restrictions that shall be observed during the
operation of the ERFS II. Compliance with these limits
will allow the operator to safely perform the assigned
missions and derive the maximum utility from the ERFS
II.
a.
The maximum capacity of one ERFS II tank as-
sembly is 825.5 US Gallons. The usable fuel in one
ERFS II tank assembly is 800 US Gallons when single
point pressure refueled.
CAUTION
Trying to pressure refuel the tanks without
connecting the vent lines could overpres-
surize the tanks.
b.
The maximum pressure inside the ERFS II tank
should not exceed 5 PSI.
CAUTION
Conducting suction defueling at pres-
sures greater than minus 11 PSI could
damage the internal components of the
ERFS II tank assembly.
c.
The maximum allowable suction defueling pres-
sure is minus 11 PSI.
